Star Pistol Serial Numbers

Hi all, Don't know enough about the Star BM and I can't find any info for what I am needing to know. I've been looking at a Star BM at my local gun dealer, he has one and its petty nice comparing it to most I have seen on the internet.

The Star Model BM is a single-action semi-automatic pistol that fires the 9 mm Parabellum. After serial number 1,560,901 in 1981, all BM pistols were fitted with a ramped and serrated front sight. At approximately this same serial number a.
I checked the firing pin as mentioned here, looked fine, bore is bright, blueing is about 95%, slide to frame fit is really nice, both mags look good. The ones I have seen, on the right side of the slide and the frame there is a diamond shape followed by #'s on the slide and right below it is a matching diamond and #on the frame, and then either on the slide or frame on the same side is a import mark, usually C.A.I on the ones I have seen, and then there is a SN on the frame above the trigger. The one I am looking at doesn't have the diamonds with #'s it just has Interarms stamped on it, don't remember any other marking there, there might be some but I don't remember, and there is no SN on the frame any where. However, there is what appears to be a SN on the side of the barrel at the ejection port and a stamp on top that at first looked like a flaming bomb, but a closer look it was a circle with some kind of mark above that, the dealer said that behind the grips was a SN that matched the one on the barrel. I didn't look. But I haven't bought it yet. Question, is this correct, is it from a earlier era, before import marks or just what is it, would appreciate any info on this, I really like the this pistol, and from what I have heard they are great little pistols.
Regards, Papabear. I drug out the two Star BM's that I have.
Both were commercially imported by Interarms in the 1970's or 80's before that company went under. Mine, besides the Star, Interarms and caliber markings, only has a serial number on the right side of the frame above the trigger guard. The other symbol and number markings that you describe are absent on both handguns. Nor is there a s/n on the barrels at the ejection port; there is, however, the 'flaming bomb' mark stamped on the top of the barrels in the ejection port.
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On mine, they are pretty clearly an 'ordnance bomb,' which I would assume are proof marks. Over the last couple of years there have been tons of Star BM's surplused from some foreign police or military establishment(s) and marketed by upwards of several distributors/wholesalers stateside. These would, of course, lack the Interarms markings. I have never looked at these very closely, already having a couple of Star BM's, but would assume that those with the 'diamond shape followed by #'s' are the surplused ones recently imported, as my BM's lack these markings.
C.A.I (Century Arms International) is, far and away, the largest importer of surplused military and police handguns and the presence of its moniker lends credence that these Stars were part of the recently imported batch. Likely the 'diamond shape followed by #'s' were required to be applied by Star as part of the stipulations of the police or military contract. The Star markings and caliber designations differ in style and location on my BM's, so the presence of a s/n on the barrel in the ejection port of the one you are considering just indicates that it was something that Star decided to do during the period that that particular BM was manufactured. I also suspect that somewhere on the frame is a serial number, as all firearms imported since 1968 had to have such to be legally imported. This generation of little Star autos was very popular in their day as they were the most powerful compact autos (except for the Star PD in.45 ACP) until around the mid-1980's when other manufacturers began introducing lots of compact autos in major (9mm and up) calibers. They are big handguns compared to the recent Kahr 9mm and.40 pocket autos, but are easier to shoot and not a heckuva lot harder to carry concealed.