Hey I have asked about a similar gun before, 'original' 45, a very sturdy break barel springer the one my mrs grandad has is about 30 years + old, it feels solid, the engraving was on the top of the top of the rifle before the break, just infront of the scope rail, in plain view. People on here said in mint condition they are worth about £100, but you have to be a master clocksmith to work on the trigger ect. They were well made and a little cheaper than some of the top producers at the time.
Hope this is of some help if it is the rifle mentioned,
.atb. .ste.