Some Russian aircraft have two serial numbers, one is called заводской номер (factory number) and another one is серийный номер (serial number).
For example, https://www.jetphotos.com/photo/10839497, B-705M's factory number is 171C00156177667U and serial number is 76-67 (source: https://russianplanes.net/reginfo/177663), the uploader chose to choose 76-67 as the serial number.
While https://www.jetphotos.com/photo/10978176, B-72C7's factory number is 171C00156207982U and serial number is 79-82, (source: https://russianplanes.net/reginfo/205050), the uploader chose to choose 171C00156207982U as the serial number.
So which number should be the Serial Number to input during uploading photos?
For example, https://www.jetphotos.com/photo/10839497, B-705M's factory number is 171C00156177667U and serial number is 76-67 (source: https://russianplanes.net/reginfo/177663), the uploader chose to choose 76-67 as the serial number.
While https://www.jetphotos.com/photo/10978176, B-72C7's factory number is 171C00156207982U and serial number is 79-82, (source: https://russianplanes.net/reginfo/205050), the uploader chose to choose 171C00156207982U as the serial number.
So which number should be the Serial Number to input during uploading photos?
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