319,1103 = 335300,979300
177,355 = 211000,320100
629,124 = 609500,116900
167,670 = 202000,599200

Taking 319,1103 and 177,355:

horizontal difference = 142pt
eastings difference = 124300m
1pt = 875.35m

vertical difference = 748pt
northings difference = 659200m
1pt = 881.28m


Taking 629,124 and 167,670:

horizontal difference = 462pt
eastings difference = 407500
1pt = 882.03m

vertical difference = 546pt
northings difference = 482300
1pt = 883.33m


Taking 1pt=882m and 167,670:

Predicted eastings = 147294
Actual eastings = 202000
X origin is 54706m west of map, 62.02pt left.

Predicted northings = 590940
Actual northings = 599200
Y origin is 8260m south of map, 9.37pt down.


Taking 1pt=882m and 319,1103:

Predicted eastings = 281358
Actual eastings = 335300
X origin is 53942m west of map, 61.16pt left.

Predicted northings = 972846
Actual northings = 979300
Y origin is 6454m south of map, 7.32pt down.


Take X origin = -61.5pt, Y origin = -8.4pt