Corey and Jeff,
Thank you for your responses, and to Lou for the Wikipedia entry.
Having used rubber cement extensively doing paste ups for graphic designs in
the pre-computer days, I don't think I will go that route. I like the idea
of the polyester double stick tape, since it is probably less reactive with
both the lacquer and the (no doubt) acidic paper label. Unfortunately,
since the label is torn and yet still partially attached, there would be no
way to secure the label using double stick tape without some part of it
being at risk for catching and tearing. The torn edge is just too irregular
to conform to double stick tape.
If anyone can suggest a glue that would not damage either surface, I would
be grateful. I imagine this is not a rare problem for archivists, given the
number of instantaneous lacquers I have found with either loose labels or
missing labels. In the short term, I will just store it in a paper sleeve
without a center hole, until I can get around to cleaning it.
Best wishes, Mark