Zinsco fuse block

Zinsco Uniflex main disconnect only, meterbase panel, 1967 stick framed home. There is a newer cutler hammer panel inside with all circuits. I report on Zinsco’s basically everyday but have not seen this before. I wrote up the same as any other Zinsco panel, if anyone has any info about this I would appreciate it.

If this is a fused disconnect and not a Zinsco breaker, there should not be any issue.