Byzantine Empire Mikhaēl VII (Constantinopolis mint)?

Hello,
I got my coin as Mikhaēl VII (Constantinopolis mint)
Weight: 5.4g
Diameter: 25mm


I found here:
Mikhaēl VII (Constantinopolis mint)
SB1878 but the weight does not fit. Has somebody an idea?
Thanks for help
Peter

Seems to have been clipped or overstruck on an earlier follis...

Byzantine Empire: Michael VII Ducas (1071-1078) Æ Follis, Constantinople (Sear 1878; DOC 14b)

Obv: Bust of Christ Pantokrator facing, bearded, with cross behind, wearing tunic and himation; right hand raised before breast in blessing, left hand holds book from beneath. In field, IC and XC above lateral arms of cross; six-pointed stars beneath them to left and right
Rev: +MIX AHΛ RACIOΔ; Crowned bust of Michael facing, bearded, wearing modified loros with collar-piece and crown with cross and pendilia, holding in right hand labarum, in left globus cruciger
Dim: 26mm, 7.39 g, 6h

The weight is off I think. Because I believe it is a clipped coin. Back in the day people use to cut off the edges of coins save them up until they had a nice little pile. That is why Sir Issac Newton Came up with the reed edge for coins. So if someone clipped the coin. Shopkeepers wouldn't accept the coins if the reeds were missing.