Hi, my 2c worth the gun is as you know is made by Gasper, O'Connor's gun was made by Eusebio. There is a world of difference between these two makers. Gasper was the low to medium end maker, where Eusebio was more of a custom/semi-custom higher end maker.
The saying goes with spanish guns of this period to buy the gun. It is very true, some of the earlier spanish guns looked great, but the insides were a whole different matter.
As to the price - I must say even for a Gasper it is not bad. Considering you can buy a Stoeger or Spartan SxS for the same $$$, I think the Gasper would handle more like a "Classic SxS not a 2x4.
Good Luck to you om whatever you decide!!
All the best!
Greg