My smallest bottle find to date

[bottlerocket]

I was out metal detecting today and while digging a hit, I uncovered this smalle bottle. I am thinking perfume.
It has a threaded top but I am unsure of the age. 20s to 50s is a wide guess.
It is the smallest bottle I have found. There is a 10 embossed on the bottom. Side seams go all the way up.
Are there any "littles" experts on here?
Thanks

 

[goodman1966]

I'm thinking finger nail polish, maybe ?

 

[botlguy]

I'm no expert even though I collect "Littles" but I'm pretty sure that is a perfume give away such as Fuller Brush dealers gave out. Back in the 1960s I was a Fuller Brush man. Jim

 

[RED Matthews]

Neat!! I have two boxes of little bottles.
This one looks like a perfume. The most interesting ones to me were used to hold fluid for needle injections liquids. RED Matthews