First Parker firearm, some ID questions

[Benjamin Duncan]

Hi all,

New here as of tonight but very interested to read these threads. I've just acquired an 1889 Parker 10ga, serial #58537 with 32" Damascus barrels, frame size 3 and weight of 5lb 8oz according to the ID page. Was wondering if anyone had additional information as I'm having a bit of trouble deciphering the grade (Not sure about the 2 or the E?) and would like to know as much as possible about it. It's a bit rough around a couple of edges but other than the aftermarket butt plate I think this is probably the most gorgeous gun I own.

Thanks for any and all information.