Quazzy - Inkspot - Heritage Glass....Welcome to the Forum !!
Interesting about Downer & the Jersey Devil. I think Clevenger Bros also had a Jersey Devil bottle, but it wasn't a scroll flask...? anyway...welcome.
It's obviously a machine made bottle , looking at the base.
It's obviously made by Fairmont Glass ...."F"
I "guess" the 1898 on this example, instead of the other series of numbers may have something do with its capacity/size , when made, (but not in the year 1898)... mold number ???
Hard for me to tell from your pix and there isn't any info available about whether they were, other than what you noted.
Look at the base and it may be easy to tell if they are indeed clear. Otherwise, take a sharp object and see if you can scratch the color off (inside & out)...do it in a not...