The cn is as quoted by the FAA but that is questionable as it relates to a Bucker built machine when this is a CASA built one

Built in 1937.

Built in 1943. Ex Spanish AF ES.1-41 and G-BZTJ.

1943 vintage. Ex Spanish AF and G-BZTJ. Crashed in Latvia in July 2018 en route from Biržai Airport (EYBI) to Riga-Central Airport (EVRS). The real c/n (between 101 and 125) is unknown. It is registered with the last part of its Spanish Air Force serial ES.1-41 as c/n.

This Bücker is registered with its export line number 51 as the c/n. The real c/n is not known, but is between 101 and 125. It was built in July 1941 as Spanish Air Force 35-28, was reserialled ES.1-28 and later E.1B-28, and became civil as D-EIII in Dec-1982. In Mar-1989 it became OO-EII and in Jul-2012 it became D-EPAX.

The real c/n (between 101 and 125) is unknown. As G-BZTJ it is registered with the last part of its Spanish Air Force serial ES.1-41.

This Bücker is registered with its export line number 51 as the c/n. The real c/n is not known, but is between 101 and 125. It was built in July 1941 as Spanish Air Force 35-28, was reserialled ES.1-28 and later E.1B-28, and became civil as D-EIII in Dec-1982. In Mar-1989 it became OO-EII and in Jul-2012 it became D-EPAX.

The real c/n (between 101 and 125) is unknown. As G-BZTJ it is registered with the last part of its Spanish Air Force serial ES.1-41.

The real c/n (between 101 and 125) is unknown. As G-BZTJ it is registered with the last part of its Spanish Air Force serial ES.1-41.

Pushed outside to start the engine, just to give it a run. (Nikon D610 + Nikkor 18-35mm f/3.5-4.5G ED AF-S)

She was pushed outside to start the engine, just to give it a run. (Nikon D610 + Nikkor 18-35mm f/3.5-4.5G ED AF-S)

Seen in the hangar of Requena. (Nikon D610 + Nikkor 18-35mm f/3.5-4.5G ED AF-S)

This Jungmeister originally belonged to Spanish aviator Col. José Luis Aresti Aguire. In the middle 1960's it was found in an aircraft junkyard in Spain by aerobatic pilot Mike Murphy. He bought it from Aguire and shipped it to the USA. It was rebuilt during 1966-67 where the 160hp Siemens-Bramo Sh 14A engine was replaced with a 185hp Warner Super Scarab engine. It flew again 26 July 1967. On 5 May 1973 it was handed over the EAA Museum. This aircraft is normally given as a Dornier-built Bü-133 with cn 31 but that is incorrect as that was still HB-MKE when that crashed in 1972 in Switzerland. This must be a CASA 1.133L, but the real c/n is not known.