[CW] mystery (spark transmitter?) straight key

[Henry Meils]

Hello,

Please see attachment:
We have a two identical keys of unknown origin at our coastal radio station musem, OXA /OZ1OXA .

(The original station was first operative in 1908 and the museum building is located at the Nyholm Naval facility in Copenhagen (www.oxa.dk), opem to visitors during the summer season.)

Can anyone identify this key as to origin and application?

Thanks in advance,

Henry F. M.,  OZ1UF-OU5T, Cph., DK