Hi Steve,
Technically only Langenhan made airguns imported by Martin Pulvermann were named Millitas but the word has been used to describe this type of airgun. The stock mark is new to me but the airgun does have some Langenhan features, such as overall style and that side barrel release catch. This style of airgun was exported all around the world (I have a French marked example) and not just Pulvermann imported them into the U.K. Anson called his the Ansonia and Lincoln Jeffries sold his under the Lincoln name.
I suspect Dennis got it right if he called this a Millita type - his book contains a lot of useful information, although the early and late models have been mixed up.
The serial numbers on these airguns often ran into five digits and not a lot has ever been determined from studying them. The 10 is unlikely to be a date stamp as I do not know of any others.
I admit to being intrigued by the butt markings - looks like a stylised Edgar Brothers!
Kind regards,
John
Currently looking for Baikal Makarov pistols with the following prefixes to the serial number: 98, T01, T09, T21, T22
Prefer boxed or cased but will consider loose examples too.