The scope is a Beeman Model 5002 2.5x32. The rifle has a quickly replaced 1 1/8" long safety that was easily bumped off, thus, replaced with a 3/4" long safety. Also, no "N" stamp on receiver. All I know about this is what I read here:
Rare Beeman Guns
"As noted, we started to import various Beeman model airguns from the Dianawerk factory, but none were highly popular* and all should be considered as desirable collectors' items. These were the Beeman Model 100. 200. 250 and 400 air rifles. and the Beeman Model 800, 850 and 900 air pistols. The Beeman Model 200 rifle was the very rarest of all; I recollect that less than 100, perhaps less than 50, such guns ever were made. All of the above Beeman model guns were made In .177" caliber only.
We discovered two successive defects in the operation of the large plastic safety mechanism of the Beeman Model 250 rifle. The first problem was that the original safety protruded so far that the hand of the shooter, even in a fairly normal shooting position, could inadvertently push the safety into the off position. In the safe position, that safety protruded 1 1/8“ (29mm) from the receiver. This was corrected by reducing the length of the huge safety bolt which protrudes from the rear of the receiver. Only a handful of guns came in with the long safety. One of these extremely rare early specimens was used in our cover catalog photograph of the 7th edition of the Beeman Precision Airgun Guide. If you have a Beeman Model 250 which has a safety like that illustrated in detail on page 36 of that catalog you have an extremely rare gun.
The second problem that we discovered was that this safety could fail if the trigger had been pulled excessively hard. As required by law, we notified the Consumer Product Safety Commission and cooperated with them in an industry-wide recall of this and all related models. The safeties of all guns returned under this recall, and all guns in the stock of dealers and jobbers, were converted to a new form. They still had a large plastic mass protruding about 3/4" (20mm) from the receiver in the safe position, but were differently designed internally and bore an “N" at the rear. Many of the extra long safeties that had existed on the U.S. market were replaced with this new short “N" version, making the long safety versions even rarer. Any version of the Diana or RWS 45, Hy-Score 828, or Beeman 250 (which were all variations of the same gun) without the "N" marked safety must be considered an uncommon item, but the "long safety" Beeman 250 must be considered the rarest of all. Anyone having a gun with these old safeties should send it to Beeman or RWS, before using it again, for a free new safety. Ask for the old safety back to maintain the collectors' value. Do NOT use guns with the old safeties."
And.
"Even sights** are now collected; both as authentic accessories for early gun models and as items in themselves. Any Beeman aperture sight without adjustable dovetails must be considered as a rare item as well as the early Beeman model 5001, 5002, 5003, and 5004 riflescopes and model 5010 pistolscopes."
Thanks, again for any help.
WILDPIG
