I don't believe that is a Clevenger bros. reproduction.
The quality of their repros were better than what you have posted, esp. that lip on yours.
I believe their repro lip is sheared.
Joel-sorry I didn't get back to you sooner, away on basketball and soccer...I agree with Woody-I don't know what to make of the railroad flask -perhaps Mike-early glass or Jeff Noordsy might have an answer...I'm trying to work it out so I can go to Ballston Spa on Sat. I'll be in touch-John
that appears to be one of the czech reproductions definatley not clevenger the clevenger was the worst example of the railroad repo i have seen a couple like that the horse is skinny and all the detail is to crisp teh real flasks all have open pontil on the base although 1 of the czech repros done around 1920 and again in 1950 era and they did have pontil marks but then other parts would be diffrent all in all mckearins book talks about teh reproduction and at 1 point how good some of the czech ones were done they also did some that have that flared out lip hope that helps alittle that is the flask that i collect i need a GV-1 to have #1 thru 10 with also the 2 variations of #3 and #7 have a good one
bob