**Exhibit4.73**

**Execution Version**

**Notice ofAssignment in relation to Talisman Parent**
| To:    |   | Talisman Energy Inc.        |
|--------|--------|-----------------------------|
|   |   | Suite 3400                  |
|   |   | 888-3rd Street S.W. Calgary |
|   |   | Alberta                     |
|   |   | Canada T2P 5CS              |

 

**m.v.“BLEO HOLM” (the “Equipment”)**

We refer to the guaranteegiven and delivered by you, Talisman Energy Inc., to us, Bluewater (FloatingProduction) Limited (the “**Assignor**”)dated 29 November 2005 (the “**Guarantee**”)relating to an bareboat charter of the Floating Production, Storage andOff-loading Vessel Bleo Holm for the Ross Field dated 30 November 2005 (the “**Contract**”).

We hereby give younotice:

# 1                                that,by a General Assignment (the “**Assignment**”)dated 29 June 2006 made between (inter alios) us and ING Bank N.V. (the “**Assignee**”), we have assigned to the Assignee all of ourrights, title, interest, and benefit (present and future, actual andcontingent) in, to, under and pursuant to (inter alia) the Guarantee including(but without prejudice to the generality of the foregoing) our rights toreceive certain monies and make certain claims for damages under and pursuantto the Guarantee; and

# 2                                that,unless and until you receive notification from the Assignee or ING Bank N.V.,you are irrevocably authorised and instructed to pay all amounts payable to us underand pursuant to the Guarantee to account name “BFP Assigned Account”, accountnumber 02.00.22.158, with ING BankN.V., acting through its Amsterdam head office, or to such other account as INGBank N.V., acting for these purposes as the agent of the Assignee, may fromtime to time direct;

# 3                                thateach amount paid by you in accordance with paragraph 2 above shall discharge,by a corresponding amount, your payment obligations under the Guarantee.

Please acknowledgereceipt of this notice by signing the acknowledgement endorsed on the enclosedduplicate of this notice and returning that duplicate direct to the Assignee atthe address shown, with a copy to us.

For and on behalfof**Bluewater (Floating Production) Limited**by its duly authorised attorney-in-fact
|                    |   | /s/ [ILLEGIBLE] |   |   |
|--------------------|--------|-----------------|--------|--------|
|               |   |            |   |   |
| Dated 29 June 2006 |

 

 

Confirmed andagreed.**ING BANK N.V.**by its duly authorised attorney-in-fact
|                    |   | /s/ [ILLEGIBLE] |   |   |
|--------------------|--------|-----------------|--------|--------|
|               |   |            |   |   |
| Dated 29 June 2006 |

----

Acknowledgement ofAssignment - Talisman Parent Guarantee
| To:   |   | ING Bank N.V.                           |
|-------|--------|-----------------------------------------|
| Copy: |   | Bluewater (Floating Production) Limited |

 

We acknowledge receipt ofthe notice set out above and consent to the reassignment and assignmentreferred to therein. For the avoidance of doubt, this acknowledgement shall notbe interpreted as affecting in any manner our rights pursuant to the quiet useand enjoyment letter dated 12 July 2006 between ING Bank N.V., as agent for thelenders, various Bluewater companies, Talisman Energy Inc. and Talisman Energy(UK) Limited.

For and on behalfof**Talisman Energy Inc.**by its duly authorised officer
|                     |   | /s/ [ILLEGIBLE] |   |   |
|---------------------|--------|-----------------|--------|--------|
|                |   |            |   |   |
| Dated 12 July 2006. |

 

2

----