Those awkward covers!

When you collect postal history you occasionally run into a problem that I call the Too Much Happiness problem: you find a cover that fits into multiple categories that you collect. It makes for awkward decisions, as you're unlikely to find a similar cover.

As an example, here's one cover that caused me some headaches:

Bilingual postmark, I collect those. Nice single franking of USSR stamp, I collect those. Registration label with ASSR name manually added, I certainly collect those. Improvised "Express" label, how could anyone not collect those?
Crap. I have to find about 3 more covers exactly like this one...