I was able to negotiate the purchase of a new (to me) double and now have it in hand. The rifle is by EM Reilly and marked on the damascus barrels as "450 Express Bore". I started a recent post about the "CP" markings this has on its barrel flats but I don't think we've resolved the meaning of this marking.

Bores are Henry pattern rifling and bright. Hammers are rebounding. Jones underlever. Horn grip cap and steel checkered and engraved buttplate (I really like the steel plate after seeing what the worms did to the horn plate on my other double, a Dickson in 500 BPE).

Serial and Henry PUN suggest 1883-4.

Extensive engraving, which is what got me hooked initially.

Weight is on the lighter side at 8.6lbs. 26" barrels probably help. Muzzle heavy balance.

Now the search begins for brass, dies and bullets.

Any recommendations on bullet starting weight based on the gun weight?

Pics below. I apologize in advance for the size. Still not comfortable with hosting service (I sure miss photobucket before they became uber greedy)