GD Yeti no date?

I have a 12oz bottle of Great Divide Yeti Imperial Stout without a date on it. I have had my fair share of Yeti and its variants so I know what the bottling date looks like but this bottle in particular has a space for a date but the date isn't there. Any other markings on the bottle that could help me figure out how old it is? My guess is ~1year-1.5years based on when i bought it. Thanks in advance!!!