Flea market find with odd etching

[Fayalso]

The shape of this reminds me of lab equipment. I’ve been able to figure out that it was made by the Owens-Illinois Glass Company post-1954. The bottom has G-1775 above the logo, 3 on the left, 5 on the right, and 5 below the logo. There is an underlined 10 (or possibly IO) on the lower edge. Somebody has added etched lines and symbols. There are lines labeled 1.85 oz. and 1.54 oz. There is also a line near the bottom with a symbol I can’t decipher. The side has the letter F in a circle and on the bottom it appears to say N.g. I’m curious what this bottle may have been used for--a lab experiment or someone’s oddly specific salad dressing recipe?

 

[CanadianBottles]

I think I've seen these before, I feel they were used in soda bottling plants. Something to do with measuring syrup? Not totally sure though.

Edit: I remembered correctly, here's a link talking about them https://www.collectorsweekly.com/stories/53597-coca-cola-syrup-bottles?in=84

 

[Fayalso]

I think I've seen these before, I feel they were used in soda bottling plants. Something to do with measuring syrup? Not totally sure though.

Edit: I remembered correctly, here's a link talking about them https://www.collectorsweekly.com/stories/53597-coca-cola-syrup-bottles?in=84

Wow! that is what it is! A search using the right terms brings up many more examples, including these from the same company as mine.

https://etsy.me/3ij3yKH

I don’t see etching on any of the these others, though. I wonder if it also had something to do with syrup or if the bottle was reused for a different thing. Thank you for giving me a starting point to look for more information. Maybe I’ve stumbled on the secret recipe

 

[CanadianBottles]

I'm guessing that the etching is because they were using the same bottle to test different things, so they put their own markings onto it to see where they wanted the levels to be for each machine or formulation. What I don't understand is why the others don't have markings for where the fill line should be, since this seems like a pretty important thing to have if you're testing syrup levels.

 

[Dave in Waukegan]

The OI mark refers to Owens Illinois glass company.

 

[Fayalso]

The OI mark refers to Owens Illinois glass company.

Yes, thank you, the Owens-Illinois logo is on the bottom. It’s a capital I inside an O which is supposed to indicate that it was manufactured after 1954. On the side, near the bottom edge, is an underlined 10, or possibly the letters IO. Is this also an Owens-Illinois logo? It seems counterintuitive, as it is in the wrong order.

 

[Dave in Waukegan]

That looks like a number 10 to me. Bottle plant?