I acquired a Fluke 8060A a few years ago from a local business closing down, the case had yellowed significantly, it was filthy dirty and had a few soldering iron melt marks. God knows how old it was but i'm pretty sure it hadn't been calibrated since the day it was made.
I didn't think much of it at the time but decided to compare it to a brand new Fluke 289 my work had just bought thinking the 8060A was likely to be way out of calibration. Surprisingly the 8060A was still absolutely spot on, I couldn't believe it when both meters agreed within 1 or 2 counts on the least significant digit on various resistance, DC voltage and current ranges.
It cleaned up nicely and is actually more accurate than all of the pricier (£80) Tenma meters that work also purchased.
So in short no, I wouldn't bother, just check it against another meter if you can get hold of one and you may be pleasantly surprised.