Where is the frame number stamped on a LM1

[S2DUC]

Guys,
Where is the frame number stamped on a LM1? Engine # is clear and usually the VIN is the same as the engine number. So where on the bike is it stamped?

[fotoguzzi]

under the vin tag on steering neck.

[S2DUC]

UNDER ?? Then how do you tell what it is without removing it?

[Cam3512]

The VIN is the number stamped on the tag.  Should match the number on the engine.

[fotoguzzi]

The VIN is the number stamped on the tag.  Should match the number on the engine.

depending on the year, they don't always match.