Thanks Jef, that was very helpful.
I couldn't find what distinguished this model from other Originals anywhere, so thanks for that.
The chap said the gun was serviced about three years ago. He's asking for £120, I'll ask him to post me some pics to see if it has the palm shelf.
As for accuracy, what can I expect compared to modern SSP's?
I guess the reason I wanted a full-on target grip was because I'm shooting with an el cheapo Beeman 2004e and obviously it's not a target pistol and the sights aren't great and the grips aren't suitable. Although still a bargain for £35
If the 6m did need servicing, would it be an expensive job, or something I could maybe do myself?
Many thanks for all of the continued help.