100% certain that's an FN "supreme" action. It has Belgian proof marks and the "chrome vanadium steel" was an FN marking used in that period. FN did not put its crest on the receiver ring on all rifles, especially late model rifles like yours.
All Santa Barbara actions ( that I've seen) are marked "Spain" on the underside. They also have a different shaped safety.
One of my FN commercial Mausers. Not a Supreme, but I had been looking for the big logo, undrilled, for a long time. These are fine rifles, and a real bargain for the build quality. I am a huge fan. If you decide to sell, keep me in mind.
Swampokie, what's your plan with this rifle? If it was mine I'd shoot and tune on it till I was satisfied and then wear the barrel out. Deja vue, nostalgia whatever but you just can't get a new rifle with the quality of that these days without spending a pile. It's greatest value is in knowing it is second to none in use. Lucky you. Mb
" Cheapest velocity in the world comes from a long barrel and I sure do like them. MB "
I bought 10 of the Dumoulin Mauser actions from Sarco, and they have problems: 1) Scope mount as I have said before These bases can be made by S46 and S54, by milling the bottoms flat. The holes are already at 0.860" and 0.504". The thicknesses are already close, but this process makes them equal. The holes and countersinks are already correct, making this process low effort and low risk of an error. 2) Safety...the safety should push back the firing pin 0.030". If OTOH the firing pin falls onto the safety when the trigger is pulled.... the gun will fire when the safety if turned off. 3) Sharp edges
My 1950 FN Mauser was a great rifle after I restocked and rebarreled it.
The Parker Hale take off barrels I got appear to be hand lapped.
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway The man who makes no mistakes does not usually make anything.-- Edward John Phelps
Every FN I’ve owned with the factory barrel has had Chrome Vanadium Steel marked on it. One was apparently shortened to eliminate the ramp and turned down a bit to lighten it, removing that marking.