The serial number X33349 is for a 1945 rifle made at BSA Shirley as Roger Paynepointed out. The scope is of the same vintage and is a British
made No.32 Mk.III (may be written as 3) with the last part hidden under the bracket clamp. The OS. 2039 A indicates definitively that it is a MK. III ( or Mk.3) and there are other clues to that effect.
It would help if you photograohed and described the markings.
What is the serial number marked on the left side of the scope bracket?
What is the number (if any) stamped into the wrist i.e. upper surface of the butt, just underneath or behind the cocking piece?
Is there a “T” stamped on the left flat side of the body by the ejector screw?
What markings are on the left side of the body socket? It is likely that they will read:
M47C
1945
X33349
TR
You should find “S51” stamped on the underside of the butt and “S” on the small square flat area of the body, just below the bolt head.
You should find the serial number of the rifle stamped lengthways on the underside of the fore-arm either as X33349 or as 33349.
Why do you think it is fake Amadeus76? Only because of the low price? If a seller, who bought it for a hundred dollars or so in the early 1970s has not looked around at current prices, you might indeed get it for a great price.
Chances are the scope is mismatched to the rifle as most were mismatched when sold by surplus dealers, but if the bracket SN matches the rifle and the scope SN matches the wrist, it is likely a treasure.