I can appreciate an old school 1911 Colt and revolvers being engraved. I just don't think it suits an HK. Much like putting racing stripes on a BMW or Mercedes Benz.
Funnily enough I actually liked the aspect of it being a brick. I saw it as a Fred Flintstones' gun.
That blows my mind you had 7 of them!
You must have had good foresight.!
I don't know if this is a heads up or a heads down.
This is one of my favorite calibers for the P7:
( I don't care for the engraving )
https://madisonguns.com/master-engraved-ultra-rare-h-k-p7m10-40s-w-nickel-semi-auto-squeeze-cock-pistol/