What kind of bike is this?
What type of seat did it have?
I only found a number stamped under the crank: 1620
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Not sure if the title has something to do with this, but those sure are funny looking chainring teeth. – BSO rider Sep 18 '16 at 16:25
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3@BSOrider - Skip link chains have 1 inch pitch, not 1/2 inch pitch, hence the funny look. – Batman Sep 18 '16 at 17:08
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If you go to a bike shop, they can take a pair of calipers and measure the seat tube in order to get you an appropriate seatpost (or take an existing one and adapt it with a shim). – Batman Sep 18 '16 at 20:28
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31620 looks like the date of manufacture! :-) – David Richerby Sep 19 '16 at 8:21
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It's probably newer than 1620, but not by much. I would guess pre-WWII. You might get a clue by determining the brand/style of the rear hub. – Daniel R Hicks Aug 25 '17 at 3:14
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This era of bicycle is especially hard to pin, it could be a Elgin, Hawthorne/Wards, Phillips, an Iver Johnson or many others that were making similar bikes. Do the pedals have any words on them embossed in the plastic?
If i had to guess i would agree that it is a Pre-WWII as other have said probably around mid to late 30's. Many frames back then had the dual top tubes however many had a bend in the upper one and a "gas tank" in between them. I assume there is not head badge or any other kind of markings? If original the hub and components may lend some information but it is difficult to say from this era.
The saddle was likely a dual rear spring leather "brooks" style saddle that looked something like the one seen on this Iver Johnson:
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This is an old bike! This bike was probably made pre or during WWII when the chain for bikes was being modified/advanced. The Skip link chains were thought to be stronger and were used on many bikes in that time period. They were used for power, not for speed. The Cogs have a "tooth", or one chainring spike every other space.
