You just found it!
This is Nordiska Aviatik Bolagets (NAB) Type 12. American roots is evident - this is copy of Twin JN with floats. I thought to post the picture from Janes that you found but later discover this article:
NAB12
As I understood swedish language, it was tested in june 1918.
Scoreboard at the end of Challenge No. 467.
90.0 Varese2002 ¤
59.5 Dave_Kent ¤
51.9 Rbailey ¤
18.95 Cruze
17.5 YavorD
15.5 Froggy
13.3 Rod Filan
12.3 Aquilius
9.6 Flamingo
8.1 Breguet
7.7 Dan-San
7.7 EdStevens
7.6 trp81
7.4 JohnMacG
7.3 Patrick
7.1 Colin A. Owers
6.7 Ampovandak
6.1 joegertler
6.0 Eric Goedkoop
5.8 richard B
5.6 ercoupepilot
5.5 FOKKERJ Feuchtwanger
5.45 GregE
5.3 Crimso
5.3 Der Grüne Flieger
5.2 Doc
5.2 Gilles
5.1 bshatzer
5.0 Tom L
4.7 dpolglaze
4.4 Ross Moorhouse
4.3 edmondthieffry
4.0 greenknight
3.7 Berman
2.7 matte_kudasai
2.5 Gregoire
2.1 Crankcase
2.0 sobrien
2.0 Rickenbaron
1.7 Kilian
1.6 sergio_vitalio
1.3 Cigogne
1.2 Ransom E. Olds
1.0 airplane176
1.0 austin08
1.0 Cliff
1.0 cubsfan4life
1.0 gregorydquist
1.0 Luf-Rick
1.0 matte_kudasai
1.0 Mike Westorp
1.0 paolomiana
1.0 Peter Zambori
1.0 rammjaeger
0.8 Machinbird
0.8 tbstreet
0.8 toxisch
0.6 Sreiko
0.5 Martin Irvine
0.4 Vilkata
0.3 Nieuport14
0.3 Miroslav Pokorny
0.3 albapfalzd3
0.2 Paul_J._Fisher