1 Pair V Blocks, precision ground with clamp, used, within .0007" of 45 degrees

Description

For sale is a precision ground set of 45 degree per side V Blocks, with a clamp, I am a 35 yr machinist and I set up a sine vise at 45 degrees in a Bridgeport mill and ran a .0001" indicator across the larger V's and all were within about .0007" across the 45 degree angle, most of the V-blocks I'm selling were within about .0003 across the largest 45 degree angle, but some were about .0006 out, so I'll say .0007" on all my listings.
I inspected the sine vise to my Starrett blocks which are guaranteed to be within about .0001 or .0002" accurate, so I know my inspection setup is accurate. (shown in the last 3 pics). These 2 V-blocks look to be the same and were probably ground at the same time, but I did not check them to see if they are a perfectly matched set. The large 45 degree angle is very accurate and the large V's are very close in size.
If the used v-blocks you are buying have not been inspected by a professional, how do you know what you are buying? (unless you do not care if the angle is accurate and you are going to re-grind them anyway).
The only name that is on these is "Natch", so I think these may be home made and not a name brand. Both of these are about 2.720 x 2.493 x 1.750", so they were probably ground together.
I have a few more V-blocks for sale also that I also inspected, so please check them out also.
Thanks for looking.