I think these are pre-war. Early Linkman Grabows had aluminum dots, circles, or shank stamped spades.
Yep, pre-war I'd say. The Linkmans stamp was not used after 1943-44.
Thanks! The stem is indeed vulcanite. I've seen that scoop shape on stingers before. I never realized a scraper was their intention.
Grabow freaks will tell you that Grabows DO NOT have stingers! They have CLEANERS ! Over the years those cleaners went through several different configurations. In the 1950's after HLT bought out Linkman and changed all of the screw type connectors to the Ajustomatic (which was originally produced by Van Roy Pipe co. - another company bought by HLT) which had a removable cleaner.
The very early Linkmans Grabow are sometimes stamped MLC (Mary Linkman Co.) and may not have the patent number. These do not have an insert in the shank. The threads in the shank are cut directly into the wood.These were made before the patent was actually issued. For more info on "cleaners take a look at RJ McKays site --
http://www.drgrabow-pipe-info.com/cleaners09aa.html Nice looking Deluxe and a nice job shining it up !