VICTOR TYPE SR 300 SAFETY VALVE, USED - VG

Description

See photos for contents and condition. I got this at an auction and do not know much about it.  There are some small scratches, spots and dings.  There are several tiny, light scratches on the clear glass gauge cover.  I do not know when it was made.  It weighs about 3 pounds and is 6 3/4 inches long.  I do not know the metal types.  Only the gauge cover sticks to a magnet. The rest does not.   I could not find another one for sale so it could be rare.   Any information about this valve would be appreciated.
Satisfaction guaranteed.  If it does not work perfectly, I'll issue a full refund.  I'll pay shipping if you want to return.  Please check out my eBay store - tevawaugh. I have lots for sale including other parts.