Help identifying Brake Calipers

I have a set of calipers which I am trying to identify...

Since I can't find any porsche part numbers, I am at a loss. The calipers have the following markings:

Front calipers have a 282 and a 280 on the front, a 17 and a 18 on the rear, and a 286 and 6-11 on the rear

Rear calipers have a P73 and a P75 on the front, P38 P35 on the rear and 0529 0519 6-25 on the rear

What are these worth (or are they boat anchors)?

Thaks, David

David,

Look like just a regular set of 'A' and 'M' calipers from '76 thru '83 production, fronts are 48 mm and rears 38 mm piston diameter. Value depends on whether bores and pistons are corroded or not.

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Warren Hall
1973 911S Targa