Some assumptions from Greco-Iberian script

By simple assumption

It seems likely that in the prehistorical Iberia script, there is no Samek, but Greek had.

The heave version of the R, might be derived from the Qof

Latin did not contain Sade, but Iberia script contains the Sade, as heavy version of the S

it seems the heavy version of the M is derived from Waw.

similarity has been detected with Anglo Saxon Rune.

it seems likely that the source of the O might be derived from the 3 sources:

Het, eyein and Pe