The Beholla pistol was developed by Becker & Hollander. During WWI it was a secondary military pistol used by the German Army. It was manifactured from 1915 until 1918, where, at that point, about 45,000 were produced.
The Beholla pistol was also manufactured under the names Menta, Leonhardt, and Stenda, and was manufactured by Becker and Hollander, and Waffenfabrik August Mentz, both of Suhl, Germany.
To disassemble remove the magazine. Use a hammer and a thin punch, and the gun well supported, drive the pin inside the hole in the slide, out from left to right.
Push the slide back until the safety catch can be turned up into the notch in the lower edge of the slide, locking the slide back.
Push the barrel straight back, (using a hammer if necessary and protecting the muzzle) so the dovetail section beneath the breech slides clear of it's mount in the frame. Once free ithe barrel is lifted clear.
Grip the slide, depress the safety, and allow the slide to move forward and off the frame.
Remove the recoil spring and it's guide. DO NOT strip further.
Reassemble in the reverse.