Originally Posted by 18 Wheeler
Sounds like a Walther LGR. Here's a photo of mine so you can confirm the ID (the one on the right!).
They do fetch decent money. Value will depend on the variant, condition, accessories and whether any seals have been replaced etc so some more info and photos will help in giving a reliable estimate. Typically £200 for a serviceable example to £350+ for an excellent and desireable model. HTH
Yes identical to the one on the right requires seals but in very good condition