Re: 5-String mandolin?
It's a five-course, ten-string mandolin, often called a mandriola. These are not too uncommon, and I'm not surprised that it's German-made. In the US, Oscar Schmidt Co. in New Jersey made a fair number of them. The use of "bridge pins" to anchor the string loops is something I haven't seen before; usually metal tabs or posts are part of the tailpiece, with generally one post for each string, rather than doubling them up. Notice, however, that the string loops encircle the protruding part of the "pin," rather than being inserted into the instrument body and held in place by the pin, as in a steel-string guitar.
Markneukirchen, in Saxony, is a centuries-old locus for instrument manufacture, especially violins, mandolins and guitars. A quick Google doesn't yield info about a Guerima instrument manufacturer or dealer, though.
Perhaps an odd choice for the cover of a book of Irish tunes, but publishers often just pick a stock photo of the featured instrument.
Allen Hopkins
Gibsn: '54 F5 3pt F2 A-N Custm K1 m'cello
Natl Triolian Dobro mando
Victoria b-back Merrill alumnm b-back
H-O mandolinetto
Stradolin Vega banjolin
Sobell'dola Washburn b-back'dola
Eastmn: 615'dola 805 m'cello
Flatiron 3K OM
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