Are there certain scenarios in current your life, within the next couple of years, in which you can visualize yourself wearing it? ("lunch with
that friend at
that tapas-bar" / "afternoon at
that gallery wearing
that dress" / "family stroll along the beach promenade")
If you
can visualize the bag in a setting within the next 1-2 years,-
go for it.
If you can't, leave it, - 2-tone Nappa Sabrina will be possible as long as Marco is making his handbags, and 2 years from now yours colour preferences may have changed.
One of my handbag-tests used to be whether I could visualize myself wearing a spesific bag in my home town Oslo

.
But... that did of course, as intended, limit my number of bags ...
so I gradually extended the test to include London and Paris...

So I now have very many bags, I pray my taste does not change, and I have sadly no alibi for buying any more

.