Hi Al..!
Again - I'm probably the wrong person to be answering this - BUT, your description sounds exactly like mine. For example - mine is E/135 proofed and the barrel has the serial number without the letter suffix. Overall, it's probably rated at about 90%-92%, depending on who is doing the rating.
As for price - OH MY!! - I dunno, I just checked a few "42" byf's on the internet and previous auctions - and the current pricing appears to be anywhere from $1800 (non RIG) - to about $3000 (RIG)

Ummm - suffice it to say - I paid a LOT less then either of these two figures... It's not to say I'm a "smart shopper", but rather "even a blind pig finds a truffle on occasion" would be me appropriate to my acquisition
Now - stop reading this reply - and get your scanner cranked up!!
John D.