Dating a Sterling Silver Peterson with No Hallmarks

Thats an interesting pipe. I didnt know they were allowed to mark it sterling silver without the appropriate hallmarks.

From Peterson Pipe Project...doesnt explain the missing marks but is interesting. The missing marks may make your pipe quite unique.
Silver Band Dating

Silver hallmarks are placed on the silver after an assay office, in Peterson's case, the Dublin Assay Office, has verified that the silver content is indeed sterling, in other words 925 parts of silver per 1000 parts of the metal. The silver hallmarks on Peterson pipes are a group of three marks, each in an escutcheon; the first is a seated Hibernia denoting Dublin Ireland, the second is a harp denoting the silver fineness, and the third is a letter denoting the year. The style of letter and the shape of the escutcheon the letter is in, will determine the year in which the assay office stamped the metal band and not necessarily the year the pipe was made. Peterson orders these bands by the thousands and sends them to the assay office for hallmarking. The assay office will stamp the date of the year in which they received the bands and it may be a year or two or three before Peterson's employees happen to place one of these bands on a pipe though generally the bands are placed on a pipe in the year they were stamped.

Peterson silver pipes made for sale in the United States had no requirement to be hallmarked, so they weren't. I learned this from Peterson expert, Mark Irwin (he is writing the upcoming book on Peterson pipes). Mark told me most were sold thru Irwin Ries in Chicago.

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Correct Al, hallmarking is only necessary if the pipes are sold in one of the "hallmarking convention" countries. The USA has no hallmarking convention of their own, so pipes sent for export did not need to be assay tested. This also saved a little bit of money on production as each and every silver band that was assay marked had to pay for the test.