LONDON, July 1 (Reuters) - WTI Midland crudedifferentials weakened on Monday after a lower offer and as buying interest ground to a halt, while there were no indications on North Sea benchmark grades.

* Trading houses Trafigura and Gunvor had bought nine cargoes of crude that underpin the Brent benchmark between June 21 and June 28 and bid for more.

PLATTS WINDOW

* Indications are on a free-on-board (FOB) basis unless marked as cost, insurance and freight (CIF) or delivered at place (DAP).

* No deals, a trade source said.

* WTI Midland: Glencore offered CIF Rotterdam July 25-29 at dated Brent plus $1.95, equating to around dated plus 79 cents on a FOB basis, according to Reuters calculations, cheaper than Thursday's value. No bids or offers were seen by Reuters in Friday's expiry session.

* Johan Sverdrup: Equinor offered July 18-20 at dated Brent plus $1.30. Johan Sverdrup is not part of the Brent benchmark.

* No indications on North Sea benchmark grades, a trade source said.

Reporting by Alex Lawler, Editing by Shinjini Ganguli

 NORTH SEA CRUDE OIL DIFFERENTIALS AND OUTRIGHT PRICES: 0#BFO-DIF 0#C-E Dated BFO BFO- Brent BFO-BRT BFO-E Forties BFO-FOT FOT-E Oseberg BFO-OSE OSE-E Ekofisk BFO-EKO EKO-E Monthly North Sea crude loading programmes O/LOAD OPEC OPEC NSEA North Sea CRU crude oil PROD oil products DRV derivatives PRO/E European products OILOIL NYMOIL, IPEOIL, OILSPD, OILARB CRDWLDPRODEUR, PRODUS, APROD ENERGY energy speed guide CRUDE/1 crude speed guide