Glad your family gave you a nice gun. You will enjoy it. The pattern is not he same as the 873. The 873 had more engraving and was executed differently. It was more refined. As far as the gold washed lock work Arrieta did this at one time on some of the older models. Even when they quit doing this you could for an additional charge they would do this on any model gun. I did not see if you mentioned if this had the assisted opening feature. This feature was somewhat standard on most of the higher grade models with a couple of exceptions. If the gun came standard on a model, you could have Arrieta delete it from the model and save a fair amount of money. If the arrieta model did not come with it as standard, it could be added to a non assisted model for an added charge.
As mentioned above the cheek piece and the sling swivels are out of fashion.
I feel Mr. Roberts is optimist of the value at $4500
Sincerely
JOhn Boyd
Quality ARma