Urgh I would advise anyone with the Irish Wars book to tear out those "artists impressions" from the center of the book and throw them away they are so utterly invented and far from reality as World of Warcraft is from actual history.
Looking at finds and other contextual resources from the period I would be included to suggest that it is a poor representation of a coat of plates by the carver of the effigy. The banding and overlapping plates looks very much like the Visby finds
http://www.armourarchive.org/patterns/wisby_cop/ and here is a site with 25 reconstructed samples of the armours found on the site
http://www.hoashantverk.se/hantverk/hoa ... index.html which also includes the flexible spaulders represented on the effigy. At aa guess I would put it on the same timeline as the Churburg armour, taking the style of bascinet shown into context so late 14thc would be the timeline. (linky to picture of the armour just because its so pretty
http://www.1300ad.co.nz/images/armour/AB0072.jpg)
As a side note I feel that that osprey book has done more to harm the state of authenticity in kit for this period than help, the overall history and the few sources it actually uses are fine but the artwork and its grand assumptions are so vile I actually wrote a letter to the editor to complain. They are inaccurate and really just an insult to the intelligence of the readers, the prime example being the metal sock on the hand of one of the gallowglass how on earth that is meant to work is beyond me. They look like illustrations from a dungeons and dragons manual from the 80's. Ok rant over sorry about that hope the links help.