"An engraver suggested spraying with rustoleum flat black and then polishing off the top surface."


OMG!!...Whatever you do, please do not spray any part of a Parker with Rustoleum paint.

India imk in engraving will work but will need to be reapplied from time to time, seal gun with laquer .

A friend of mine who owned a very well known shop has often used paste shoe polish. Rub it on, over the entire receiver, then wipe it off with a soft cloth. The engraving will have residual polish in the depth of the cuts.

I would hate to use that gun in a 95 degree dove field. When you left you would be the laughing stock of the hunt with black stuff wiped all over your face from your blackened hands.

Firstly, the amount of polish left is minimal.
Secondly, it dries hard and is below the surface
Lastly, If you sweat that much, perhaps you should stay home.

Images
 

Here are the images. I have also attached an image of my recheckering of the stock. The triggerguard is now ok for me after the treatment. After reflectionI think the rest of the engraving is ok except for the dog on the left side.

Regards
Preston C

Just kidding Edgar. But our opening day of dove season is usually 90 to 100 degrees. Most of the opening afternoon one is soaking wet under a blazinng sun.

The engraving on your DH looks to be typical as far as condition goes.

Is that the sleeved 3 frame that has been on gunbroker for a a while?

So was I;)

Yes, but I got it for less than the asking price.
Regards
Preston C