Samsung SEF-54PZF

This flash was the Pentax AF540FGZ sold under the Samsung brand.

Pentax-compatible Samsung flashes were never sold in US stores, and since Samsung has dropped their partnership with Pentax, their newer hotshoe flashes for the NX series of cameras are not compatible with Pentax P-TTL.

You can copy from this site, with conditions. See the license page for copyright and licensing details.