Having found more information, including some 1970s catalogs, here's my updated info on Kirsten models. I haven't gone in-depth into bowls since they vary so widely, only giving a shape list.
Sizes are-- excluding 1st-gen models--
Straight:
"G" Gem (mini)
"J" Jewel (small)
"S" Sportsman (small)
"M" Mariner (medium)
"L" Lancer (large)
¼-bent:
"A" Aladdin (mini)
"H" Horizon (small)
"V" Vagabond (small)
"C" Cavalier (medium)
"T" Tyrolean (large)
"R" Regent (large)
Full-bent:
"B" Beau Geste (mini)
"W" Westerner (small)
"P" Premier (medium)
"E" Esquire (medium, cutaway pedestal valve)
"F" Firesider" (large)
"D" Designer (large, flared round pedestal valve)
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Sizes by generation--
1st Gen. - No O-rings - stamped "Pat. Appl. For" (1930s-40s) or "Pats. & Pats. Pending" (50s)
Straight:
"S" Standard (small)
"M" Medium
"L" Large
"A" Aristocrat (extra-large)
"C" Companion (rough finish Standard)
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1.5 Gen. - O-ring on valve or stem, not both - stamped "Pat. Pending" or "Pats. & Pats Pending," some say "Made in U.S.A"
Straight:
"K" Companion (small)
"M" Medium
"L" Large
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Transition models include:
Thrifty (straight w/ black reverse valve having O-ring, none on stem)
Up to this point, all except Companion are hand-polished Duralumin, a silver color, with black vulcanite stems
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2nd Gen. - O-rings - stamped "Pats. & Pats. Pending" and "Made in U.S.A."
Straight:
"G" Gem (mini)
"K" Companion (small)
"S" Sportsman (small)
"M" Mariner (medium)
"L" Lancer (large)
¼-bent:
"A" Aladdin (mini)
"V" Vagabond (small)
"C" Cavalier (medium)
"T" Tyrolean (large)
Full-bent:
"B" Beau Geste (mini)
"W" Westerner (small)
"P" Premier (medium)
"F" Firesider" (large)
"D" Designer (large, first full-bent with pedestal valve, introduced 1977)
Finishes:
-- Hand-polished Duralumin
-- X Western Satin/Heritage
-- B Black
"Western Satin" (satin coppery orange-brown) until 1974
"Heritage" (rough silvery or brassy) after 1975
Stems: black vulcanite, either standard, flat, or bite-proof (twin-bore)
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3rd Gen. - O-rings - stamped "Made in U.S.A."
Straight:
"J" Jewel (small)
"M" Mariner (medium)
"L" Lancer (large)
¼-bent:
"H" Horizon (small)
"C" Cavalier (medium)
"R" Regent (large)
Full-bent:
"E" Esquire (medium)
"D" Designer (large)
Full-bents available with with standard valve, but usually sold with pedestal valve
Finishes:
-- Silver (satin)
-- X Brasstone (satin)
-- B Black
Stems: black vulcanite, gray pearl lucite, brown pearl lucite
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4th Gen. - O-rings - stamped "Made in U.S.A."
Straight:
"J" Jewel (small)
"M" Mariner (medium)
"L" Lancer (large)
¼-bent:
"H" Horizon (small)
"C" Cavalier (medium, may be coming soon)
"R" Regent (large)
Full-bent:
"E" Esquire (medium, may be coming soon)
"D" Designer (large)
Finishes:
-- Silver (matte)
-- X Brasstone (matte gold, almost a yellow-ocher)
-- B Black (slightly glossy on the straight/quarter-bent, matte on full-bent)
Stems: black lucite, brown pearl lucite, black lucite with white thread swirl
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Cigar Holders came in "regular" and "panetela" diameters. Finishes were, by known dates:
1973-74: hand-polished Duralumin or 24-k gold-plated
1975-76: not available
1976-77: hand-polished Duralumin or "antique bronze" (polished)
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Cigarette holders eventually came in S (3 1/8"), M (4 1/4"), L (5")
1950s, hand-polished Duralumin, and a four-color ladies' set was offered, colors unknown. All in L size
Finishes were, by known dates:
1973-74: hand-polished Duralumin or 24-k gold-plated
1974-76: hand-polished Duralumin
1976-77: hald-polished Duralumin or "antique bronze," "autumn gold," "sunset red" (all polished)
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At some point, sets of 8 corn cob holders were produced, in silver finish
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Bowl shapes:
Billiard (cup shape)
Columbus (rounded, widest point above center)
Brandy (rounded, widest point below center)
Mandarin (two cones attached at widest point, some 4th Gen narrower)
Dynasty (Mandarin with inwardly-sloped rim, discontinued)
Midway (spread conical with narrower top, 1st Gen, discontinued)
Bavarian (conical with rounded top, 2nd Gen, discontinued)
Danish (tulip shape with inwardly-sloped rim, discontinued)
Bulldog, 1st Gen (kettle shape, two cut rings)
Bulldog, 1970s (rhodesian style, two cut rings, inwardly-sloped rim)
Castaño (4th Gen, bulldog with rough bottom half)
Italian (4th Gen, narrow Columbus)
Some bowls were made by Kaywoodie in the 50s or 60s, mainly miniature, slightly flared billiard shape with light finish (some have small fills)
In the late 70s or early 80s, a small number (perhaps a few hundred) true freehand bowls with plateau top were made. One claim is that these were mainly given out or sold to big names in the pipe retail industry. Mine belonged to a Tinder Box owner. Many are engraved, a service offered to regular customers as well. All freehands I've seen so far were Designers (I've seen them in brasstone, polished silver, and Heritage)