A Beta Alp is 199cc or 400cc. Based on a Suzuki engine, electric start.
The 199cc is great trail bikes, 400cc a bit top heavy.
This looks to me like a Beta 240 Supertrial with a big seat, never seen an Alp with USD forks, and the LH view show the Beta engine clearly.
But a Beta Alp, it is not.
Spares should be avalable from any Beta dealer.