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100-450 usd
50-500 usd
No published sn data. No way to ID model without more of a description.
.700 Nitro Express
a .700 nitro express
There's the .700 Nitro Express.
The highest caliber bullet commonly used is a .50 cal. However, there are bullet that are larger in caliber. the 700 Nitro express comes to mind.
There are several, such as the .600 Nitro Express and .700 Nitro Express, not to mention anything considered a cannon.
Without a detailed description, 20-60 USD
50-400 USD; @ 30-40 yrs old
I am not aware of any published serial number data.
The Chinese B-3 is rated at 450 FPS by the Manufacture. This is considered to be slow in the world of .22 caliber air rifles. As an example the Hatsan model 95 fires a .22 caliber pellet at 800 FPS and a Crosman Nitro Venom fires a .22 cal pellet at 950 FPS.