My gun has "Fusil Oleoneumatico" on the RHS of the black plastic handle and directly below that it says "Pat. Spain, USA and Other Countries". That is simply stating that it is an "oleo-pneumatic gun"; "Fusil" is Spanish for gun, so "Fusil" is not the model name of the gun. On the LHS it says "Nemrod" and "Made in Spain". All the "Silver" series guns have this same black plastic handle, the words moulded into the handle are therefore exactly the same on all of them, I know that for sure as a friend at the time had the "Corsario" which was the second longest model with the power selector knob at the rear end. Other models were the "Bucanero" which was the next size up from the "Comando", the longest model being the "Filibustero" with a power selector knob the same as the one on the "Corsario". At just over 60 cm my gun is the same length as your gun, so your gun is also a "Comando". I have never heard of a smaller "Silver" series gun, it certainly is not mentioned in the adverts or the service manual for the guns.
Thanks for the offer of the seals, but I was mainly curious as to how they fitted in the tubular aluminum cups of the piston which are designed to press the original cylindrical seals with ribbed cone outer ends onto the spine of the piston in order to prevent leaks through the centre of the piston. The original seals were compressed slightly and trapped in place on the metal spine by the two circlips seen in my photo which firmly located the smaller aluminium caps at the centre of each seal's outward face. I now have two spare pistons, the first had deteriorated in drawer storage, but the second and more recent one seems OK having been greased and wrapped up by the original owner. Although good in its day, I found the "Sten" and "Miniministen" much better guns for the conditions that I dived in and so soon put the "Comando" in storage. Many years later I tried the gun again and found it seemed very sluggish to shoot, so I dismantled it to find that the piston seals had gone even though the gun still held air pressure, the by then completely reverted rear piston seal acted like a brake instead of sliding freely in the inner barrel. I only bought the replacement pistons as and when I happened to come across them, they probably would have been thrown out otherwise. A lot of old gun spare parts were junked by subsequent owners of old dive shops who had no idea which guns they belonged to, often finding them unlabelled in the "odds and ends" box at the rear of the store. One owner said that he wanted to sell new guns, not keep ancient one's going, so he put all his miscellaneous gun parts in the trash bin.
