Hi all,
I had a lovely email back from Herr Haggards and Raimey was spot on; it's a Mk V;

"I find your Sauer mod. 5 in my records. Beautiful typical German flower engraving!

Yes, your was made around 1906, you can see on my homepage under Gunroom, eighth gun from top, you see the similarity in the looks apart from the engraving.

In old Sauer catalogs, the weapons are depicted with simple engravings. It was the buyer who decided according to wishes. Also choosing steel in the barrels, here you see on your gun, the buyer ordered Krupp Special Lauf Stahl, which was the best."

Thanks for all the advice and information from you all.
very best
Anne smile