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What is it that makes things sought by collectors,...
G'day Norm
That's always an interesting question. I feel the more accurate
question (from my point of view) is ...

"What is it that should make things sought by collectors"

When I think about old lawnmowers I have developed my own criteria.
The acronym is HARD.
- Heritage: How early did the company start making mowers?
Is there an interesting or important provenance?
- Aesthetics: how stylish is the particular model?
Is it appealing, unusual or weird looking?
- Rarity: how many were made?
How many survive?
- Design: did the maker introduce new or novel features?
Were these features influential on future designs?

I have found it a handy scheme for evaluation 'importance' of
old things. But I guess it doesn't really answer your question.

Cheers
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Jack