Been looking at booking a trip on one of the original unrefurbished 373s but you can’t view the seat plan until after booking and not sure you can distinguish an original to an e300.
The refurbished 373s have the same seating layout as the unrefurbished ones, except that they have the inferior 374 type seats in place of the comfortable originals.
As regards 373 diagrams - the below were officially valid until late July, but I have been told by someone in Eurostar that the current diagrams are pretty much the same. Hopefully someone with access to the information will be able to post a more up to date version. Until then, please treat the below as an indication rather than a definitive list:
Monday -5 sets
1) 9084 9087
2) 9109 9074
9057
3) 9128 9149 9054
4) 9108 9121 9032 9055
5) 9080 9023 9036
9059
Tuesday, Wednesday & Thursday - 5 sets
1) 9014 9053
2) 9110 9121 9132 9149
9158
3) 9165
4) 9074
9057
5) 9080 9032 9032 9059
Friday - 5 sets
1) 9084 9087
2) 9074 9057
3) 9080 9023 9032
9059
4) 9021 9036
5) 9108 9121 9132 9149
Saturday - 5 sets
1) 9084 9087
2) 9074 9057
3) 9014 9039
4) 9002 9023 9032 9059
5) 9110 9121 9132 9149 9158
Sunday - 5 sets
1) 9084 9087
2) 9149
3) 9025 9032 9067
4) 9074 9057
5) 9014 9039 9152