Diamond Arms was a trade name used Shapleigh Hardware for guns that were actually made by Iver Johnson of Fitchburg, MA, c. 1920-1950. Prior to that, they were made by small local makers in Belgium. These were utility grade guns. Prior to 1968, serial numbers were not required on shotguns and rifles, and there are many inexpensive shotguns that have never HAD a serial number (and yes, that is legal)
The decimal 0.5 is a half of the whole.
Two examples:
0.5 of 100% = 50%
0.5 of 50 = 25
I would start my search at Numrich gun parts corp.They may be found on the web.I would also check at E-bay,or gunbroker.com under gun parts.
Sorry- no published data. That name has been used by several makers for more than 50 yrs.
This gun is covered with scroll work in what appears to be silver. Gun performed very good. Did have a problem with side lock pin breaking.
remove barrel and serial # will be stamped on top of receiver on left
Depends on the condition. IF it is complete with the peep sight, and the fold down forearm, there is a modest collectors interest- and in Very Good condition, may run $200 or so. Missing peep sight, etc, maybe $100 or so.