A question...
What would be the purpose of a "City Pennant" back in the day? Just to wave it at parades, festivals and such? Just wondering what this pennant was made for, if not sporting events... A souvenir for tourists? Did many people vacation to Detroit back in the teens
I think it has a pretty decent chance of being a Tigers Pennant, given the block letter style and orange/black color scheme. That's just my opinion. But as mentioned by the pundits above, there are two limiting factors...
1. Unless you have a photo or other documentation, it's very tough to prove.
2. Even if it was Baseball, the value would be severely limited by the lack of attractive/eye-catching graphics.
Most collectors would rather shell out for those great Roaring Tiger Heads or Baseball-related graphics. Still a very attractive piece... just hard to assign or justify a value.