byf 42 markings

[breeze64]

Hi all.
New to the forum and these oldies.
Doing some research on this one before I spend anything.
sorry no pics to post but i did take notes on inspection.
byf 42 on top
serial 181
all parts match 81 serial so I did read this is Mauser correct ?
Right side has 2 eagles with 135 under, then another bird to the right.
http://www.lugerforum.com/lugermarkings/proof-4.html
This one looks similar to number 47. but the second mark matches the first exactly.
No rework done on this, original blue in Excellent quality, barrel looks great.
Brown walnut grips etc.
If anyone can give me any further info and or what this may be worth I would greatly appreciate it.

B